digraph test_graph {
    # this test file tries to test everything from the DOT language
    rankdir=LR;
    size="8,5"
    font = "arial"
    graph[attr1="another"" attr"]
    node [shape = doublecircle]; node1 node2 node3;
    node [shape = circle];
    edge[length=170 fontSize=12]
    node4[color=red shape=diamond]
    node5[color="blue", shape=square, width=3]

    /*
        some block comment
    */
    "node1" -> node1 [ label = "a" ];
    "node2" -> node3 [label = "b" ];
    "node1" -- "node4" [ label = "c" ];
    node3-> node4 [ label=d] -> node5 -> 6

    A -> {B C}

}